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The Ferrite Ring Combo Pack is a convenient solution for
troubleshooting RFI/EMI from unknown frequencies or multiple frequencies
that require multiple suppression mixes. Included in this combo pack
are ten 2.4″ OD/1.4″ ID ring toroids as follows:

The ring toroids are useful for AC/DC common mode choking with multiple turns as shown below

AC Cable on F-240 Toroid – 7 turns

DC Cable on F240 – 4 turns

The ring toroids can also be used on coax or signal lines as shown below:

RG58 12 turns on FT240

Ethernet Cable on F-240 Toroid – 7 turns

For RFI/EMI wrap as many turns as possible (usually 6-12) for higher choking (under
30 MHz). For over 25-100 MHz, 1-3 turns om Mix 61 is usually sufficient. Chokes can also be cascaded in series to offer a broader frequency range.

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